I can tell you that Marriott VC does not bother you or treat you any differently. I just stayed at the Grande Vista in August. We were treated better than any other hotel I have ever stayed at. The entire staff from front desk to maintenance went out of their way to be friendly and social every time we encountered them....even just passing in the hallway. When we needed something they were immediately on it and did a follow up later to make sure we got what we wanted.
As far as the timeshare pitch we were called once in our villa and invited. I said we were unsure but would discuss it and get back to them. We never heard from them again. BTW, the invite was very nice.... if you have the time we would love to see you type offer. Marriott VC is know for a true no pressure type sales pitch.